| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,496 | $13,678 |
| 2016 | $23,846 | $15,630 |
| 2017 | $24,420 | $15,633 |
| 2018 | $24,420 | $15,805 |
| 2019 | $25,994 | $17,039 |
| 2020 | $24,686 | $15,731 |
| 2021* | $25,054 | $15,904 |
| 2022* | $25,427 | $16,079 |
| 2023* | $25,806 | $16,256 |
| 2024* | $26,190 | $16,435 |
| 2025* | $26,581 | $16,615 |